“ We will be intractable against any form of violence », insisted Emmanuel Macron during a visit to a Parisian school on Friday April 5, the day after a violent and fatal attack outside a college in Viry-Châtillon. The events occurred 48 hours after the attack on a teenage girl in front of a middle school in a working-class area of Montpellier. How can we explain these ultra-violent acts and how can we fight against them? Interview with Claude Lelièvre, professor emeritus, educational historian and author of School today in the light of historypublished by Odile Jacob.